Select last 30 days rows from MARA using SSIS - sql

Question

I'm trying to select rows for last date change = 30 days.
I tried LAEDA = ( sy-datum -30 ) in where clause, but it always generated error.I connect to sap Abap database.
The message error:
[EIS-Material 1] Error: ERPConnect.ERPException: Error while
receiving function return values: SYSTEM_FAILURE An error has occurred
while parsing a dynamic entry. at
ERPConnect.RFCAPI.ReceiveFunctionResults(UInt32 connectionHandle,
RFC_PARAMETER[] importing, RFC_PARAMETER[] changing, RFC_TABLE[]
tables, Encoding apiEncoding) at
ERPConnect.RFCFunction.ReceiveFunctionArguments(RFC_TABLE[]&
apiTables) at ERPConnect.RFCFunction.CallClassicAPI() at
ERPConnect.RFCFunction.ExecuteRFC(Byte[] tid) at
XtractKernel.Extractors.TableExtractor.GetPackage(RFCFunction& func)
at XtractKernel.Extractors.TableExtractor.Extract() at
XtractKernel.Extractors.ExtractorBase`1.Extract(ProcessResultCallback
processResult) at XtractIS.XtractSourceTable.PrimeOutput(Int32
outputs, Int32[] outputIDs, PipelineBuffer[] buffers) at
Microsoft.SqlServer.Dts.Pipeline.ManagedComponentHost.HostPrimeOutput(IDTSManagedComponentWrapper100
wrapper, Int32 outputs, Int32[] outputIDs, IDTSBuffer100[] buffers,
IntPtr ppBufferWirePacket)

Answer 1

So you are using a third party tool to extract data from an SAP system. According to the error message, the toole makes a Remote Function Call (RFC) and handing the SQL to the ABAP backend. Then your where condition must be valid ABAP/Open SQL syntax, regardless of the database behind.
Your call (simplified) would look like this in ABAP (with new #-syntax):
DATA(lf_dat) = sy-datum - 30.
SELECT matnr
FROM mara
WHERE laeda >= #lf_dat
INTO TABLE #DATA(lt_matnr)
.
The problem is, that you are not allowed to make this calculation within the the statement, as far as I know, so you have to use a variable. But since your third party tool only allows you to write a where condition I see no way to handle this, except with a static date in the condition:
laeda >= '20190106' "YYYYMMDD
You can add the ABAP tag to your question to attract more specialists on this ABAP specific topic.

Answer 2

I see in the Xtract IS online help that there's a custom function module named Z_THEO_READ_TABLE installed at ABAP side, which executes the SQL sent by Xtract IS. The module is provided in 2 flavors, one being for ABAP >= 740 SP 5, so I guess it's a version for ABAP SQL Strict Mode.
So, I thought that maybe you could write this ABAP-like Where Clause by using a "host expression", which is valid in ABAP SQL Strict Mode :
LAEDA = #( sy-datum - 30 )
Based on the error message you have, "An error has occurred while parsing a dynamic entry", I guess that this function module does something like SELECT (dyn-columns) FROM (dyn-table) WHERE (dyn-condition), i.e. all elements are dynamically defined at run time.
Unfortunately, the "ABAP documentation sql_cond - (cond_syntax) says that "Host expressions are not allowed in dynamic logical expressions."
So long, impossible to make a where clause as you wish.
There are probably many ways to get around this limit (like creating a SAPquery or BAPI in SAP and calling it from Xtract IS, etc.) but that's another question.

Answer 3

In mySQL / MariaDB, this works:
select ...
from ...
where date >= DATE_ADD(CURDATE(), INTERVAL -30 DAY)
but we need to know what database you are working with.

Answer 4

You may try it, if you use SQL database:
Select DATEADD(Month, -1, getdate())

Answer 5

You cannot specify ABAP formula like that through SAP Open SQL.
Not to directly resolve your challenge (as you have product limitation), here is how dynamic filter is achieved through AecorSoft tool:
(DT_WSTR, 4)(DATEPART("yy" , GETDATE())) + RIGHT("0" + (DT_WSTR, 4)DATEPART("mm" , GETDATE()),2) + RIGHT("0" + (DT_WSTR, 4)DATEPART("dd" , GETDATE()),2)
For complete use case, you can check the blog SAP Table Delta Extract Made Easy through Dynamic Filters